My sky + remote is getting a bit worn down, and I am looking to replace it with a new one. I know how to get them, but I have a question about programming it to the tv and sky box. Should I take the batteries out of the old remote before loading the new one up with batteries, so the controllers don't mix with each other? It may seem a silly question, but I don't want to mess things up. Any help would be great. Thanks. P.S. I've got instructions on how to programme a new controller to the tv and box.